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@ARTICLE{Martini:866592,
      author       = {Martini and Pacheco-Labrador and Perez-Priego and Tol, van
                      der and Madany and Julitta and Rossini and Reichstein and
                      Christiansen and Rascher, Uwe and Moreno and Martín and
                      Yang and Carrara and Guan and González-Cascón and
                      Migliavacca},
      title        = {{N}itrogen and {P}hosphorus effect on {S}un-{I}nduced
                      {F}luorescence and {G}ross {P}rimary {P}roductivity in
                      {M}editerranean {G}rassland},
      journal      = {Remote sensing},
      volume       = {11},
      number       = {21},
      issn         = {2072-4292},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2019-05673},
      pages        = {2562 -},
      year         = {2019},
      abstract     = {Sun-Induced fluorescence at 760 nm (F760) is increasingly
                      being used to predict gross primary production (GPP) through
                      light use efficiency (LUE) modeling, even though the
                      mechanistic processes that link the two are not well
                      understood. We analyzed the effect of nitrogen (N) and
                      phosphorous (P) availability on the processes that link GPP
                      and F760 in a Mediterranean grassland manipulated with
                      nutrient addition. To do so, we used a combination of
                      process-based modeling with Soil-Canopy Observation of
                      Photosynthesis and Energy (SCOPE), and statistical analyses
                      such as path modeling. With this study, we uncover the
                      mechanisms that link the fertilization-driven changes in
                      canopy nitrogen concentration $(N\%)$ to the observed
                      changes in F760 and GPP. N addition changed plant community
                      structure and increased canopy chlorophyll content, which
                      jointly led to changes in photosynthetic active radiation
                      (APAR), ultimately affecting both GPP and F760. Changes in
                      the abundance of graminoids, $(\%graminoids)$ driven by N
                      addition led to changes in structural properties of the
                      canopy such as leaf angle distribution, that ultimately
                      influenced observed F760 by controlling the escape
                      probability of F760 (Fesc). In particular, we found a change
                      in GPP–F760 relationship between the first and the second
                      year of the experiment that was largely driven by the effect
                      of plant type composition on Fesc, whose best predictor is
                      $\%graminoids.$ The P addition led to a statistically
                      significant increase on light use efficiency of fluorescence
                      emission (LUEf), in particular in plots also with N
                      addition, consistent with leaf level studies. The N addition
                      induced changes in the biophysical properties of the canopy
                      that led to a trade-off between surface temperature (Ts),
                      which decreased, and F760 at leaf scale (F760leaf,fw), which
                      increased. We found that Ts is an important predictor of the
                      light use efficiency of photosynthesis, indicating the
                      importance of Ts in LUE modeling approaches to predict GPP.},
      cin          = {IBG-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000504716700103},
      doi          = {10.3390/rs11212562},
      url          = {https://juser.fz-juelich.de/record/866592},
}